Project Creation and Structure

Go package Structure

Kubebuilder projects contain 3 important packages.

cmd/...

The cmd package contains the manager main program. Manager is responsible for initializing shared dependencies and starting / stopping Controllers. Users typically will not need to edit this package and can rely on the scaffolding.

The cmd package is scaffolded automatically by kubebuilder init.

pkg/apis/...

The pkg/apis/... packages contains the API resource definitions. Users edit the *_types.go files under this director to implement their API definitions.

Each resource lives in a pkg/apis/<api-group-name>/<api-version-name>/<api-kind-name>_types.go file.

The pkg/apis package is scaffolded automatically by kubebuilder create api when creating a Resource.

pkg/controller/...

The pkg/controller/... packages contain the Controller implementations. Users edit the *_controller.go files under this directory to implement their Controllers.

The pkg/controller package is scaffolded automatically by kubebuilder create api when creating a Controller.

Additional directories and files

In addition to the packages above, a Kubebuilder project has several other directories and files.

Makefile

A Makefile is created with targets to build, test, run and deploy the controller artifacts for development as well as production workflows

Dockerfile

A Dockerfile is scaffolded to build a container image for your Manager.

config/...

Kubebuilder creates yaml config for installing the CRDs and related objects under config/.

  • config/crds
  • config/rbac
  • config/manager
  • config/samples
docs/...

API reference documentation, user defined API samples and API conceptual documentation go here.

Providing boilerplate headers

To prepend boilerplate comments at the top of generated and bootstrapped files, add the boilerplate to a hack/boilerplate.go.txt file before creating a project.

Create a new project

Create a new kubebuilder project. This will automatically initialize the vendored go libraries that will be required to build your project.

$ kubebuilder init --domain k8s.io --license apache2 --owner "The Kubernetes Authors"

Create a new API (Resource)

Create the *_types.go file and controller.go files.

For more on resources and controllers see What Is A Resource and What Is A Controller

$ kubebuilder create api --group mygroup --version v1beta1 --kind MyKind

Run your manager locally against a Kubernetes cluster

Users may run the controller-manager binary locally against a Kubernetes cluster. This will install the APIs into the cluster and begin watching and reconciling the resources.

# Create a minikube cluster
$ minikube start

# Install the CRDs into the cluster
$ make install

# Build and run the manager
$ make run

Create an instance

Create a new instance of your Resource. Observe the manager logs printed to the console after creating the object.

$ kubectl apply -f sample/<resource>.yaml

Deploying your manager in a Kubernetes cluster

Users can run the controller-manager in a Kubernetes cluster.

# Create a docker image
$ make docker-build IMG=<img-name>

# Push the docker image to a configured container registry
$ make docker-push IMG=<img-name>

# Deploy the controller manager manifests to the cluster.
$ make deploy

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